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Strapi
🚀 Strapi is the leading open-source headless CMS. It’s 100% JavaScript/TypeScript, fully customizable and developer-first.
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payload
The best way to build a modern backend + admin UI. No black magic, all TypeScript, and fully open-source, Payload is both an app framework and a headless CMS.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Yesterday I found Strapi which has almost everything I need, but admin permissions are not available to handle on the free version. And I have found similar issues with almost every CMS available right now.. Their free version is quite limited.
https://payloadcms.com/ You can check payload cms. It's highly customisable, free for self hosted, integrates with FE framwork like nextjs, remix etc. And you can manage everything from config file. White labeling is also possible. They have awesome blog posts for different topics.